---
schema_version: "secwatch.filing_event.v1"
accession: "0001493152-25-014684"
form_type: "8-K"
ticker: "GTBP"
cik: "0000109657"
company_name: "GT Biopharma, Inc."
filed_at: "2025-09-23T23:59:59+00:00"
generated_at: "2026-05-17T05:51:30.277149+00:00"
event_type: "other"
sentiment: "positive"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# GT Biopharma series L preferred holders waive redemption rights permanently

## Summary
- Holders of Series L 10% Convertible Preferred Stock waived redemption rights under Section 10 of the Certificate of Designations.
- Waivers were provided on September 17, 18, and 23, 2025, and are permanent.
- Waiver does not affect other rights of the preferred stockholders under the Certificate of Designations.
- The company requested the waiver; certain holders countersigned the form of waiver.

## SEC filing metadata
- accession: 0001493152-25-014684
- form_type: 8-K
- ticker: GTBP
- cik: 0000109657
- company_name: GT Biopharma, Inc.
- filed_at: 2025-09-23T23:59:59+00:00
- event_type: other
- sentiment: positive
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 3.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/109657/000149315225014684/0001493152-25-014684-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/109657/000149315225014684/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001493152-25-014684
- JSON: https://secwatch.observer/filing/0001493152-25-014684.json
- Plain text: https://secwatch.observer/filing/0001493152-25-014684.txt

## Key facts
- Equity Issuances
  GT Biopharma, Inc. issued preferred stock to certain of the holders of GT Biopharma, Inc.'s Series L 10% Convertible Preferred Stock.
  - Security: preferred stock
  - Purchaser: certain of the holders of GT Biopharma, Inc.'s Series L 10% Convertible Preferred Stock
  source text: each of September 17, 2025, September 18, 2025 and September 23, 2025, certain of the holders of GT Biopharma, Inc.’s Series L 10% Convertible Preferred Stock (the “Series L Preferred Stock”) provided a waiver (the “Waiver”) to the Certificate of Designation of Preferences, Rights and Limitations of Series L 10% Convertible Preferred Stock (the “Certificate of Designations”)
  evidence_url: https://www.sec.gov/Archives/edgar/data/109657/000149315225014684/0001493152-25-014684-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.